Device for driving fasteners



DEVICE FOR DRIVING FASTENERS Filed Dec. 23, 1949 i INVENTORS fiazwr Z Use/N6 ,fneer A 0/70.

TORNEY Patented Nov. 3, 1 953 DEVICE FOR DRIVING FASTENERS Robert L. Siering and Harry S. Ford, New York,

N. Y., assignors to Johns-Manville Corporation, New York, N. Y., a corporation of New York Application December 23, 1949, Serial No. 134,782

The instant invention relates to an improved device for driving fasteners and is particularly adapted for operation of a driving head of the type shown and claimed in the copending application of William S. Miles, 55. N. 33,508, filed June 17, 1948, now Patent No. 2,563,479, dated August 7, 1951. The copending case describes and claims the construction of the driving head or device and illustrates its use for securing panels, such as fibrous acoustical panels, to a supporting ceiling or wall structure. Briefly stated the driving head includes a body portion adapted to be received within a power tool which imparts reciprocatory mot-ion to the head and a tip adapted to enter preformed recesses in the panel. The tip carries a headed fastener which is driven through the panel and into the support by the reciprocation of the The instant invention has for its principal obi ct the provision of improved device for imparting the reciprccatory or driving motion to a head of this type. More specifically an object of the invention is the provision of such device adapted to be operated by a standard rotary driving means such as an electric hand drill.

A further object of the invention is the provision of a device of such type designed to cause the head to strike the nail with forceful, rapidly repeated hammer blows.

A still further object oi the invention is the provision of a device which attains the foregoing objects and which is of relatively simple and inexpensive construction.

Our invention will be more fully understood and further objects and advantages will become apparent when reference is made to the more detailed description of the invention which is to follow and to the accompanying drawings in which:

Fig. 1 is a perspective view illustrating a use i the device of the'instant invention;

Fig. 2 is a side elevational view of the device attached to a standard electric drill or the like;

Fig. 3 is a sectional view through the device on an enlarged scale;

Fig. i is a sectional view, taken on the line ii of Fig. 3; and,

Fig. 5 is a perspective detail view of a cam element of the device.

Referring now to the drawings, the device oi the instant invention is illustrated as employed in the installation of ceiling panels. It will be appreciated, however, that it may be used for many other purposes where it is desired to convert rotary motion to rapidly repeated impact 6 Claims. (01. 1--47) blows. In the illustrated use of the tool the ceiling consists of a plurality of panels ill to be secured in contiguous relationship on furring strips !2, or other nail receiving supporting meclia. The panels shown are of the type conventionally used for acoustical correction purposes, namely, fiberboard panels having a plurality of sound-entry recesses or perforations extending inwardly from the exposed face to a predetermined depth to permit the entry of airborne sound to the relatively porous interior structure. The panels are secured by collared fasteners it which are driven through the perforations locatin the corners of the panels, the nails extending through the unperforated thickness of the material into the furring strip with their collars is resting against the material at the bottom of the perforation.

The apparatus or tool employed to drive the nails is shown in 2 and comprises a power means 26, such as an electric drill of any suitable type, a nail driving head 22 of the type shown in the said copending application of W. S. Miles, and a device 2t, embodying the instant invention, for converting the rotary motion of the drill to reciprocatory motion and for imparting rapidly repeated blows to nail driving head 22.

Referring now particularly to Figs. 3, 4 and 5, devicefE i comprises a rotatable shaft 25 includ ing a shank 23 for reception within the chuck of the drill 29. The upper end of shaft 25 is received within an interior scc-.et of an anvil member 32, the anvil member being mounted for reciprocation on the shaft. The anvil member is held in assembled relationship relatively to the shaft and the extent of reciprocation thereon is limited by a pin ii -l extending diametrically of the shaft, one or preferably both of the pin projecting into axially extending slots in the wall of the anvil member. The upper end of the anvil member is provided with a striking part Cam means t9 surround the striking part, the cam means consisting preferably of two cams so, each occupying one haif the circumference of the anvil member and having rearwar .ly inclined profiles ending in abrupt drop-offs to the original starting level.

A sleeve is surrounds the end of the shaft and the anvil member, the sleeve having an upper 1' forward wall apertiu' at ist-c receive the striking 38 and an extension including a section it of reduced external diameter projecting forwardly of the end. wall and having a central bore of a diameter to receivehead 22. Section i9 is threaded for the reception of a 3 tubular collar 58. Collar 5t includes an upper section 52 having an internal bore of a diameter to receive the barrel of tool 22 with a sliding fit and a lower threaded section, the juncture of the sections defining a shoulder 53.

Head 22, which is preferably of the same construction as that shown in the said copending application of William S. Miles, has a cylindrical barrel With an intermediate section 54 of reduced diameter. The reduction of the diameter of section 54 provides an elongated annular recess 55, the recess being defined as to its forward and rearward limits by forward wall 5? and rearward,

wall 59. The walls El and 59 are preferably rounded at their junctures with reduced section 54, as shown in Fig. 3. The head includes a tip 56 having a bore to receive the extending end of nail I6 with the collar of the nail resting on the end of the tip.

The upper section 52 of collar 59 projects beyond the end of the sleeve extension a distance approximately equal to the length of the reduced section of the nail driving member or head. A split ring 58 (see Figs. 3 and l) is confined between the end of extension so and shoulder 53, the inner margin of the ring protruding into the annular space surrounding section 54 of reduced diameter. Consequently outward movement of the head is stopped upon movement of the lower end of the reduced section into contact with the ring. At the same time the head is maintained against wobbling as the barrel is confined by collar se and extension at in all operative positions of the head. The inner corners of ring 58 are preferably rounded as shown, to cooperate with the rounded jnnctures walls 51 and 59.

The lower end of the sleeve is threaded as at 50 to receive bushing 62, the latter being held in any adjusted position by suitable means, such as set screw es. A compression spring so surrounds shaft 23 with its ends pressing respectively against bushing 6i} and the lower end of anvil member 32. Two replaceable, diametrically opposed cam cocking elements 68 are carried by the sleeve, the cocking elements suitably consisting of pins threaded into the wall of the sleeve and carrying rollers E59 adapted to ride on the cams.

Device 2 is held against rotation relatively to the drill by bracket it! secured as by studs 12 to the sleeve and to the casing of the drill.

In preparing the device for operation, stem 28 is inserted in the chuck of the drill 2c, and nail driving tool 22 is mounted in the sleeve extension. This is accomplished by removing collar insorting the tool, placing split washer 53 in position and then replacing the collar. The apparatus is then ready for operation. inserted in the tip of the tool and the end of the nail placed within one of the perforations of the panel to be secured. Upon operation of the drill, shaft 28 is rotated, causing anvil member 32 to rotate with it, the cocking elements riding on the cams and forcing the anvil member rearwardly against the action of spring Eli until the cocking elements reach the abrupt drop-offs of the cams. As this happens the anvil member is forced abruptly forwardly by spring 66 to impart a sharp driving blow to the end of nail driving tool 22, which inturn drives the nail'lfi. As the shaft rotates, the blows are rapidly repeated and the nail quickly driven home.

The device operates smoothly and easily. The hammer blows are rapidly repeated as each revnail i5 is olution of the shaft causes two impacts against the nail driving tool. The force of the impacts may be regulated to some extent by the pressure which the operator uses and also by adjustment of bushing 62. As will be readily apparent, by increasing the initial compression of spring 66, an increased driving force is obtained. The device is simple in construction and operation.

Having thus described our invention in rather full detail, it will be understood that these details need not be strictly adhered to and that various changes and modifications may suggest themselves to one skilled in the art, all fallin within the scope of the invention as defined by the subjoined claims. Also, it will be appreciated that, although the device has been shown and described in connection with a tool for driving nails, it can be used in other situations Where it is desired to convert rotary motion to rapidly repeated reciprocatory motion of a character to impart blows or taps to another element, or to induce a piston-like motion.

What we claim is:

1. In a device for driving fasteners, a rotatable shaft, an anvil member carried by an end of the shaft for rotation therewith and reciprocation thereon between forward and rearward positions, a spring urging said anvil member forwardly of the shaft, a cam on said anvil member, said cam having a forwardly inclined profile with an abrupt drop-off, a non-rotatable sleeve surrounding said anvil member and shaft and including a forward extension defining a socket, a tubular collar removably mounted on said extension and fixed against reciprocation relative thereto durnormal operation of the device, a nail driving tool mounted for reciprocation within the socket and collar and for contact with the anvil memher when the latter is in its forward position, said tool having an elongated annular recess, means carried by said collar and extension and projecting into said recess for limiting the forward movement of the tool, and a cocking element carried by said sleeve for cooperation with the cam to withdraw the anvil against the action of the spring.

2. In a device for driving fasteners, a rotatable shaft, an anvil member carried by an end of the shaft for rotation therewith and reciprocation thereon between forward and rearward positions, a cam having a forwardly inclined profile with an abrupt drop-off carried by said anvil member, a non-rotatable sleeve surrounding said anvil member and shaft, a nail driving tool supported for reciprocation by said sleeve and in contact with the anvil member when the latter is in its forward position, a spring within said sleeve surrounding the shaft and bearing against the anvil member, means carried by the sleeve for adjusting the pressure of said spring said anvil member, and a cooking element carried by said sleeve for cooperation with the cam to withdraw the anvil against the action of the spring.

3. In a device for driving fasten r rotatable shaft, an anvil member carried by an one of the shaft for rotation therewith and reciprocation thereon between forward and rearward positions, a cam having a forwardly inclined profile with an abrupt drop-off carried by said anvil member, a sleeve surrounding anvil member and shaft and including a folwvardly extending socket, means for maintaining said sleeve against rotation, a nail driving tool supported for reciprocation within the socket, a spring within the sleeve surrounding the shaft and bearing against the anvil member, means carried by the sleeve for adjusting the pressure of the spring against the anvil member, and a cocking element carried by the sleeve for cooperation with the cam to Withdraw the anvil against the action of the spring.

e. In a device for driving fasteners, a rotatable shaft, an anvil member carried by an end of the shaft for rotation therewith and reciprocation thereon between forward and rearward positions, means for causing reciprocation of the anvil member upon rotation of the shaft, a non-rotatable sleeve surrounding the anvil member and shaft, said sleeve having a forward extension defining a socket, a tool mounted for reciprocation within the socket and for contact with the anvil member when the latter is in its forward posi tion, said tool having an elongated annular recess defined by forward and rear walls, a tubular collar removably mounted on the extension and fixed against reciprocation relative thereto during normal operation of the device, and means carried by said collar and extension and projecting into the annular recess of the tool for limiting the forward movement of the tool by abutment of the projecting means against the rear wall of the recess.

5. In a device for driving fasteners, an anvil member, a sleeve surrounding the anvil member and having a forward extension defining a socket, a tubular collar mounted on the extension to project forwardly thereof and having an inner diameter of the diameter of the socket, a tool slidably fitting within the collar and socket for contact with the anvil member, said tool having an elongated annular recess defined by forward and rear walls, a ring element confined between the end of the extension and the collar and projecting into the recess whereby forward movement of the tool i limited by abutment of the ring element against the rear wall of the recess, and means for causing reciprocation of the anvil member.

6. In a device for driving fasteners, a rotatable shaft, an anvil member carried by said shaft for rotation therewith and reciprocation thereon,

resilient means urging said anvil member in one direction on said shaft, a cam on said anvil memher, a sleeve surrounding said anvil member and shaft, means for maintaining said sleeve against rotation, means carried by the sleeve for adjusting the force with which said resilient means urges said anvil member in said one direction, said resilient means acting between said adjusting means and said anvil member, and means carried by said sleeve for cooperation with said cam to move the anvil member in a direction opposite to said one direction against the action of the resilient means.

ROBERT L. SIERING.

HARRY S. FORD.

References Cited in the file of this patent UNITED STATES PATENTS FOREIGN PATENTS Country Date Great Britain May 2, 1934 Germany May 27, 1932 Number Number 

